What it is and where it sits
The Omron CJ1W-EIP21 is a CJ-series communications module that snaps onto the CJ rack next to the CPU, giving the controller an EtherNet/IP port over a standard RJ45 jack on its face. It is built for the CJ platform — the same chassis family used across a long line of CJ-series CPUs and I/O — so it drops into the existing slot pattern of a CJ backplane without rewiring the rack.
Ratings and approvals that govern the panel
The module carries CE, cULus, Lloyd, and NK approvals, which covers the typical jurisdictions for a control panel: North America via cULus, Europe via CE, marine class via Lloyd, and Japanese vessel class via NK. At roughly 93.89 g it is light enough that DIN-rail mounting is the only mechanical story — no panel-cut or stud-mount provisions to design around.
Lifecycle posture
The factory lifecycle entry reads Active, while the commercial field is flagged eol_hot — a known mixed signal on this code that buyers should verify before committing a long-running BOM line. Because the status is split, treat the part as quotable to order against an RFQ and confirm availability on a per-build basis rather than assuming indefinite factory production.